Upper-layer and lower-layer joined-paving construction method of cement stabilized macadam

Abstract

The invention provides an upper-layer and lower-layer joined-paving construction method of cement stabilized macadam. The upper-layer and lower-layer joined-paving construction method comprises the following steps: (a) paving a lower layer, namely, paving a lower-layer cement stabilized macadam mixture layer on a pavement, grinding the lower-layer cement stabilized macadam mixture layer; and (b) paving an upper layer, namely, within 12 hours since mixing of a cement stabilized macadam mixture of the lower-layer cement stabilized macadam mixture layer, paying an upper-layer cement stabilized macadam mixture layer on the upper surface of the lower-layer cement stabilized macadam mixture layer formed by rolling, and rolling the upper-layer cement stabilized macadam mixture layer. According to the upper-layer and lower-layer joined-paving construction method of the cement stabilized macadam, provided by the invention, the interlayer bonding strength is ensured, the interlayer construction time can be relatively prolonged, and the construction efficiency is improved.

Description

technical field [0001] The invention relates to a construction method for joint paving of upper and lower layers of cement-stabilized macadam, in particular to a construction method for joint paving of upper and lower layers of cement-stabilized macadam applied in road construction with a certain delay time. Background technique [0002] At present, the total thickness of cement-stabilized gravel subbase and base is generally about 54cm to 60cm. There are two construction methods in the prior art. The second is layered construction. [0003] For the one-time molding process using large paving equipment and heavy rolling equipment, there are the following disadvantages: [0004] 1) Due to the limitation of equipment power, the molding thickness has certain limitations. The maximum paving thickness currently applied is 39.6cm, and its maximum paving thickness does not exceed 40cm, which cannot meet the requirements of the total design thickness of 54cm-60cm. This process cann...

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Problems solved by technology

[0004] 1) Due to the limitation of equipment power, the molding thickness has certain limitations. The maximum paving thickness currently applied is 39.6cm, and its maximum paving thickness does not exceed 40cm, which cannot meet the requirements of the total design thickness of 54cm-60cm. This process cannot be carried out One-time paving;

[0005] 2) Heavy-duty rolling equipment has a certain impact on the substructure, structures and surrounding environment, and its application has certain limitations;

[0006] 3) The compaction degree of the upper part and the lower part of the rolling layer is not uniform, and the upper part of the rolling layer is over-dense, and the lower part of the rolling layer still cannot reach the compaction degree;

[0007] 4) The cost of large-scale paving equipment and heavy-duty rolling equipment is relatively high, and the models are rare at home and abroad

[0010] 1) Many construction joints: In order to ensure that the upper layer pavement is completed within the initial setting time of the cement-stabilized gravel mixture in the lower layer, the construction section needs to be shortened, which will result in many construction joints and affect the smoothness of the road surface;

[0011] 2) Low construction efficiency: Due to the short construction section, the construction machinery usually needs to return to the joint to start again, resulting in frequent movement of the construction machinery, construction interference between road rollers and paver, etc., resulting in low construction efficiency; at the same time, due to the many construction joints , resulting in discontinuous construction, which will also affect construction efficiency;

[0012] 3) There are limitations in construction: due to the continuity of the construction links such as construction mixing, transportation, paving, rolling, etc., and interlocking, any problem in any link will cause construction interruption

[0014] 1) Long curing time: After the construction of the lower layer is completed, it is usually maintained for 7 days, and core samples are drilled. After passing the inspection, the cement-stabilized gravel mixture of the upper layer can be paved. The time between the upper layer and the lower layer is long, which affects the construction progress;

[0015] 2) Layered construction, each layer needs to be watered and moisturized for maintenance, which increases maintenance costs; according to the actual coring effect on site, it is difficult to bond the upper and lower layers into a whole;

[0016] 3) The time between layers is long, which is easy to cause pollution and affect the bonding between layers

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